Do you have any idea what you want to do? Frex, do you want to write web, mobile, desktop, command-line, or some other kind of apps, or OSes and their associated utilities, or something else entirely? That can help narrow it down. If you’re “into” some particular ecosystem (e.g., Windows, Mac, or Linux), that can narrow it further by indicating or excluding things; frex, if you want to write mobile apps and you’re into Mac, Swift is the obvious choice.
Alternately, if you’re casting about for a programming language to learn, you could try learning whatever is most different from what you already know. Done a lot of duck-typed OO scripting languages? Try a strongly typed functional or imperative compiled language. There may be such a thing already out there, but you could compose a list of the top twenty or so popular languages, marked by whether they’re OO/FP/imperative/logical/declarative or whatever, strongly or weakly typed, statically or dynamically typed, interpreted on the fly or compiled and linked ahead of time, and so on. That will make it easy to check whether your knowledge is missing some particular option in any column. Try to cover them all, and then if possible all combinations. 